10
Chapter 5
Multi Gauge
T h e m u l t i g a u g e
may read fuel, oil,
temperature and volt
functions. The fuel
section indicates the
level of fuel inside the
fuel tank. It is a good
idea to keep the fuel
tank “topped o ” when
possible to reduce condensation inside the tank. Do not
run the fuel level close to empty. Figure in an adequate
“safety” factor (1/3 rule) when monitoring fuel gauges
since they are not entirely accurate.
e oil pressure display indicates the pressure of the
oil inside the engine lubrication system. A drop in oil
pressure may be an indication of a low oil situation or
a leak. Operation of the engines with low oil pressure
could lead to engine damage. Should a low oil pressure
situation develop shut down the engine immediately and
investigate the problem.
e temperature display monitors the cooling system of
the engine. A sudden increase in the temperature could be
a sign that the engine cooling system is malfunctioning.
Shut down the engine immediately and investigate the
problem. Consult your engine manual for allowable
limits. Engine water temperature is indicated in degrees
of Fahrenheit. Engines today run warmer closer to the
180 degrees to 200 degrees.
e voltage display indicates the battery condition as well
as the alternator performance. Normal voltage is between
12.0 and 15.0 volts. Readings outside of this range may
indicate a charging system or battery problem.
Volts should be normally over battery voltage indicating
the battery is being supplied properly by the engine
alternator.
Typical engine alternator output for Volvo stern drive
models is 75 amps and for MerCruiser is 70 amps.
Note the following: stator output for outboards with
mechanical controls is 50 amps and outboards with
digital controls is 70 amps.
Speedometer Gauge
Th e s p e e d om et e r
indicates the speed of
the vessel over water.
It is indicated in miles
per hour or knots.
Trim Gauge
e trim gauge indicates
the relative angle of
the engine outdrive in
units. Degrees of trim
are indicated as the
drive unit is trimmed
up. Likewise degrees of
trim are shown as the
drive is lowered.
Tachometer
e digital tachometer
(tach) indicates the
speed of the engine in
revolutions per minute
(rpm). Marine engines
feature rev limiters to
keep the engine rpm’s
within safe limits. Select
tachometers display the
engine running hours.
Note that engine hours is the gauge for marine
maintenance schedules. Pay close attention to the
hours of running displayed on the tachometer and the
recommended system maintenance as found in your
engine operator’s manual.
GAUGE OPERATION TYPICAL
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